发布于 2016-12-28 04:58:54 | 180 次阅读 | 评论: 0 | 来源: 网友投递
Node.js 服务器端的JavaScript
Node.js 是一个基于Chrome JavaScript 运行时建立的一个平台, 用来方便地搭建快速的 易于扩展的网络应用· Node.js 借助事件驱动, 非阻塞I/O 模型变得轻量和高效, 非常适合 运行在分布式设备 的 数据密集型 的实时应用
var requestHandler = require("./requestHandler");
var server = require("./server");
var route = {
"/hello": requestHandler.hello,
"/upload": requestHandler.upload
};
server.start(route);
var http = require("http");
var url = require("url");
exports.start = function(route) {
var server = http.createServer(function(req, res) {
var pathName = url.parse(req.url).pathname;
var handler = route[pathName];
if (handler) {
console.log("Through path:" + pathName + ":" + new Date().getTime());
handler(res);
} else {
res.writeHead(404, {"Content-Type": "text/plain"});
res.end();
}
});
server.listen(8088);
};
exports.hello = function(res) {
res.writeHead(200, {"Content-Type": "text/plain"});
res.write("say hello.");
res.end();
};
exports.upload = function(res) {
res.writeHead(200, {"Content-Type": "text/plain"});
res.write("upload");
res.end();
};
function sleep(milliSecond) {
var startTime = new Date().getTime();
console.log(startTime);
while(new Date().getTime() <= milliSecond + startTime) {
}
console.log(new Date().getTime());
}
exports.hello = function(res) {
sleep(20000);
res.writeHead(200, {"Content-Type": "text/plain"});
res.write("say hello.");
res.end();
};
exports.upload = function(res) {
res.writeHead(200, {"Content-Type": "text/plain"});
res.write("upload");
res.end();
};
IncomingForm.prototype.parse = function(req, cb) {
this.pause = function() {
try {
req.pause();
} catch (err) {
// the stream was destroyed
if (!this.ended) {
// before it was completed, crash & burn
this._error(err);
}
return false;
}
return true;
};
this.resume = function() {
try {
req.resume();
} catch (err) {
// the stream was destroyed
if (!this.ended) {
// before it was completed, crash & burn
this._error(err);
}
return false;
}
return true;
};
this.writeHeaders(req.headers);
var self = this;
req
.on('error', function(err) {
self._error(err);
})
.on('aborted', function() {
self.emit('aborted');
})
.on('data', function(buffer) {
self.write(buffer);
})
.on('end', function() {
if (self.error) {
return;
}
var err = self._parser.end();
if (err) {
self._error(err);
}
});
if (cb) {
var fields = {}, files = {};
this
.on('field', function(name, value) {
fields[name] = value;
})
.on('file', function(name, file) {
files[name] = file;
})
.on('error', function(err) {
cb(err, fields, files);
})
.on('end', function() {
cb(null, fields, files);
});
}
return this;
};
var childProcess = require("child_process");
exports.hello = function(res) {
var n = childProcess.fork(__dirname + "/subProcess.js");
n.on('message', function() {
res.writeHead(200, {"Content-Type": "text/plain"});
res.write("say hello.");
res.end();
});
n.send({});
};
exports.upload = function(res) {
res.writeHead(200, {"Content-Type": "text/plain"});
res.write("upload");
res.end();
};
function sleep(milliSecond) {
var startTime = new Date().getTime();
console.log(startTime);
while(new Date().getTime() <= milliSecond + startTime) {
}
console.log(new Date().getTime());
}
process.on('message', function() {
sleep(20000);
process.send({});
});